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Tag Archives: Chemistry-Class-9

An ion is a chemical entity that has a positive or negative charge of a certain magnitude. The term ‘ion’ can refer to atoms or… Read More
Compounds with charged species are formed by combining metals and non-metals. The charged species are referred to as ions. These charged species can be either… Read More
The atomic mass of an element is the average mass of the atoms in an element, calculated in Atomic Mass Units (amu) or Daltons. Unified… Read More
Valency or Valence of an element is a measure of an atom’s ability to combine with other atoms to create molecules or chemical compounds. The… Read More
The matter is divided into three main types Compounds, Mixtures, and Elements. Pure substances are compounds. Impure substances are Mixtures. The key difference between compounds… Read More
Rutherford Atomic Model or simply the Rutherford Model is a Nuclear atom or Planetary Model of the Atom proposed by Ernest Rutherford in 1911. Rutherford… Read More
A mixture is a material that is made up of two more chemical compounds or substances that do not combine together chemically. It is actually… Read More
Mole concept is the method used to express the amount of substance. This has been experimentally proving that one gram atom of any element, as… Read More
The electron was discovered using a cathode ray tube.  An electric current was passed from the cathode (the negative pole) to the anode (positive pole).… Read More
Colloids or Colloidal solutions or Colloidal systems are a mixture in which a component made up of insoluble particles that are scattered at a microscopic… Read More
Evaporation Cause Cooling because the particles (atoms and molecules) present at the surface of the liquid surface absorb energy from its surroundings and transform it… Read More
Suspension is a heterogeneous mixture of a fluid that contains solute particles that are considerably large for the process of sedimentation. Suspensions are considered to… Read More
Mixtures are different from pure substances like elements and compounds because mixtures contain different substances that are combined physically but not chemically. The individual components… Read More
Law of conservation of mass states that “The mass can neither be created nor destroyed in a chemical reaction” French chemist Antoine Lavoisier was the… Read More
Isotopes are two or more types of chemical species or elements that are having same atomic number and the same position in the periodic table… Read More

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